<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.opengl.GLSurfaceView
        android:id="@+id/glview_call"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
    <android.view.SurfaceView
        android:id="@+id/preview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>
